[Python] 4. 회귀 : cost(mse) test, gradient, scipy.stats 예제
import numpy as np import pandas as pd import matplotlib.pyplot as plt import scipy.stats as st cost(MSE) test def cost(x,y,w): c=0 for i in np.arange(len(x)): hx = w*x[i] c = c+(hx-y[i])**2 return c/len(x) x_data = [1,2,3] y_data = [1,2,3] print(cost(x_data,y_data,-1)) print(cost(x_data,y_data,0)) print(cost(x_data,y_data,1)) print(cost(x_data,y_data,2)) print(cost(x_data,y_data,3)) [OUT] : 18...
